Method and apparatus for coating paper and the like



Nov. 2, 1937. A. POTDEVIN METHOD AND APPARATUS FOR COATING PAPER AND THE LIKE Filed June 1, 1935 INVENTOR I ATTORNEYS.

Patented Nov. 2, 1937 UNITED STATES ME'rnon Ann arranarus Fon COATING PAPER AND THE LIKE Adolph Potdevin, Garden City, N. Y., assi'gnor to l'otdevin' Machine Company, Brooklyn, N. Y., a corporation of New York f Application June 1; 1935, Serial No. 24,474

'16 Claims.

This invention relates to an improved method of and apparatus forcoating paper and the like and is particularly directed to the manufacture of wax paper.

My invention contemplates the application 0 wax to a traveling web of paper or the likein a heated tank from which the web continues its travel to a bath of cooling water or other liquid;

- upon further travel of the web the cooling liquid is removed and the web dried by air and vibration of the web.

In the accompanying drawing wherein I have illustrated a device for carrying out my invention: 1 v

Fig. 1 is a perspective view of myimproved apparatus; and v I Fig. 2 is a view partlyvin section of the drying mechanism.

- Referring to the drawing in detail, I designates a supply roll from which the web of material to be coated may be withdrawn in any suitable manner.

I levelled on the web by these rollers and surplus.

coating material removed.

The web-is drawn from between the surfacing rollers l and 5 through a tank 6 containing cooling fluid and where the web passes beneath a roller 1 which is provided in this tank. The

cooling fluid which may be water, for example,

cools and sets the wax or other coating material.

During this part of its travel the web has been caused to travel vertically over a roller 8 which is mounted a suitable distance above the discharge end of the cooling tank 6.

On its passage to the roller 8 the web is drawn past a drying station, comprising a blower 9 the discharge side of which is provided with a conduit l0 which terminates in a fork consisting of a pair of perforated conduits H and I! closed at their outer ends. The wbin its vertical travel to the roller 8 passes through this fork, and the perforations IS in each of these conduits are on the sides of the conduits adjacent the web. In

addition to the perforations l3 each of the conduits II and I2 is provided with a longitudinal spout or nozzle ll sloping downwardly toward the opposed faces of the web.

At each side of the web, below the conduits H- The web is drawn through a tank-2 con-' taining wax or other coating material which may be heated if necessary in any suitable manner.

and i2, I-provide rotary cooperating paddles l6 and il, extending the width of the web and driven by a motor l8 through a belt I9, the paddles being geared to each other 'so as to rotate toward the web, by gears 20 and 2L.

, With the paddles l6 and n in rotation air from the blower 9 is blown through the .condults I I and i2 and out through the perforations l3, and at the same time through the nozzles ll against each side of the traveling webi The paddles l6 and i1 being oil'set, circu ferentially, with'respect to each other, and rotating in'opposite directions, toward the faces of the web, it will be'evident that with the parts in the position shown in Fig. 2, air from the lefthand nozzle ll is blown down along the face of the web and is partially pocketed between the two blades i8 and I9 so as to exert lateral pressure upon the web in a direction to force the web to the right,

to the full line position shown in Fig. 2. At this same time air is issuing from the right hand nozzle M upon the right hand face of the web, but

owing to the position at this instant, of the blades 20 and 2| of the paddle H, the lateral pressure on the right hand face of the web is less than that on the opposite face, with the resultthat the web is deflected as shown in full lines in Fig. '2. On

. continued rotation of the paddles, it will be apparent that conditions will be reversed, and the web-will be deflected in the other direction to the dotted line position of Fig. 2. It will be apparent, therefore, thatthe web will be vibrated out of the plane of both faces, a motion such as would be imparted'to the web if shaken by hand. This willobviously blow and shake oil the excess cooling liquid, bearing in mind that the nozzles it are directed downwardly so thatthe air issuing therefrom tends to pass downwardly along the face of the web. As the web, freed of its'surplus cooling liquid, passes between the perforations I3 of the air nozzles, through which air is discharged directly against th face of the web, it will be instantly evaporate so that the web is now in the desired dry condition.

11; will be noted from Fig. 2 that the web is not engaged by the blades of the paddles l6 and I1 or by the conduits II and I2, so that there will be no scratching or scrapingmf the waxed surface of the web;

While I have illustrated .and described one embodiment of a device for carrying out my improved method, it is to be understood that various changes and modifications may be made therein without departing from the spirit and scope of my invention.

What I claim is 1. The method of coating paper and the like, which method comprises continuously moving a web of the material through a bath of coating material, advancing the web to a bath of cooling fluid to cool the coating and then moving the web between air streams directed alternately flrst against one side and then against the'other side to vibrate the web to removeexce'ss cooling fluid and dry the coated web.

2. The method of coating a web of material, which method comprises applying a coat. of molten coating material to the web, cooling the coating material on the web by passing the coated material through a bath of cooling fluid, then so applying an air stream to each face of the web alternately to impart a vibratory motion to the web to rid the same of excess cooling fluid.

3. The method of waxing paper, which comprises continuously moving a web of paper through a bath of molten wax toapply a coating thereto, advancing the web through a bath of cooling water'to cool the wax coating and then moving the web between air streams to dry the same and simultaneously directing alternate air blasts to each face of the paper to vibrate the web to remove excess cooling water.

4. The method of making wax paper, which comprises applying a coat of molten wax to the web, cooling the wax on the web by passing the web through a bath of cooling liquid, then applying a stream of air to each of the faces of the web and causing the air to be deflected alternately at each side against the web so as to impart a vibratory motion to the web to shake off excess cooling liquid;

5. In an apparatus for coating a web of material, which comprises a bath of molten coating material, a bath of cooling fluid, and means for drawing the material through said baths in the order named, the combination of means including air streams at each side of-the web and air deflecting means cooperating with the said air streams for imparting vibratory motion to the web to-rid the sameof excess coating fluid.

6. In an apparatus of the class described, comprising a bath of coating material, a bath of coola ing fluid, and means for continuously advancing web through said tanks, the combination of meansa web of material to be coated through said baths, the combination of air conduits on each side of the web following the cooling bath; a discharge.

nozzle for each of said conduits directed toward opposite faces of the web, means for supplying air tosaid conduits, and means for alternately deflecting the air streams from said nozzles against (Y; each face of the web thereby to impart a vibratory motion to the web to remove excess cooling fluid therefrom.

7. In an apparatus of the class described, comprising a bath of coating material, a bath'of cooling fluid, means for passing a web of material to be coated continuously combination of perforated air conduits on each side of the web beyond the cooling hath through which air is passed to each side of the web, nomles' for each of said conduits sloping downwardly to-- ward the web, means for supp ying air to said conduits, and means for deflecting the air streams from said nozzles against alternate faces of the web to impart a vibratory motion to the web to remove excess cooling fluid from the web.

8. In an apparatus for making wax paper, comprising a tank of molten wax, liquid, means for continuously advancing a paper through said baths, the

web, and means for atankofcooling' including an air stream and air deflecting means at each face of the paper for vibrating the paper after the same leaves the said last mentioned tank to rid. the web of excess cooling fluid.

#9. In an apparatus for coating a web of material, comprising a bath of coating material, a bath of cooling liquid, means for advancing the material successively through said baths, the' combination of air conduits on each side of the web beyond the cooling bath, nozzles for each of said conduits directed toward the web, said conduits and nozzles being out of contact with the web, means for supplying air to *said conduits and means for deflecting the air streams from said nozzles flrst against one side of the web and then against the other thereby to impart a vibratory motion to the web to remove excess cooling liquid from the web.

10. In an apparatus for making wax paper,

comprising a bath of coating material, a bath of cooling liquid, continuously advancingaweb to be coated through said baths, the combination of perforated air conduits spaced from the web and located beyond the cooling bath through which air is passed to dry eachside of the web, nozzles in each of said conduits directed downwardly toward the web'faces, means for supplying air to said conduits,,and means for alternately deflecting the air streams from said nozzles first against one side of the web and then against the other thereby to vibrate the web to remove excess cooling -fluid therefrom.

11. In paper waxing apparatus, comprising a supply roll of paper, an open tank of molten wax, a guide roller in said tank, a pair of superimposed surfacing rollers, means for continuously drawing the paper web from said supply roll under said guide roller and between said surfacing rollers, a tank of cooling water, a roller therein, said web passing continuously from said surfacing rollers under the roller in said water tank, the combination of air tubes, one at each side pf said web, beyond the cooling tank, each having air outlets on the side adjacent the face of the web,,means for supplying air to said tubes and rotating members for causinga deflection of the airfrom said tubes against alternate faces of the web, to vibrate the we 12. In paper waxing apparatus comprising a supply roll of paper, an open tank of molten wax. a guide roller in said tank, a pair of superimposed surfacing rollers, means for drawing the web of vpaper from said supply roll and continuously advancing the same under said guide roller in the ath of molten wax and then out of the tank and between said surfacing rollers, water, a roller therein, said web passing from said surfacing rollers under the roller in said water tank where the wax is cooled, the combination of an air tube at each side of said web, located beyond the cooling tank, and having a tank of cooling nozzles extending longitudinally of the air tubes and projecting downwardly at an angle toward the web, means for supplying .air to said tubes, rotating members for effecting intermittent deflection of the air from said tubes to vibrate the driving said rotating members.

13. In paper waxing apparatus comprising a supply. roller of paper,-a n open tank of molten wax, a-guide roller submerged in said tank,'a pair of superimposed surfacing rollers,

continuously to draw paper from said supply roll and; pass the same. under said guide roller and between said rollers, a tank of cooling 7s.

of an air line, a blower connected thereto, said line terminating in a pair of spaced air tubes, one at each side of said web, said tubes being perforated at the sides adjacent the web faces and having air nozzles extending longitudinally of the tubes and projecting downwardly at an angle toward said web, and paddles at each side of the web adjacent said tubes and so positioned as to deflect the air from said nozzles in its passage against the web, the paddle blades at one side of the web being offset with respect to the paddle blades at the other side of the web to effect deflection of the air against alternate web faces thereby to vibrate the web to rid the same of excess cooling water.

14. In coating apparatus comprising a bath of coating material, a bath of cooling fluid; means be coated -continuously through said baths, the combination of means for applying an air stream to both faces of the advancing web after it has left the cooling bath, and means intermediate the air-applying means and the coolingbath, cooperating with the air streams to efiect deflection thereof in a direction to cause lateral vibration of the web out of the plane of each face thereof.

15. In coating apparatus comprising a bath of coating material, a bath of cooling fluid, means for continuously advancing a web to be coated successively through said baths, means for effecting further advance of the web in an upward direction, the combination of means for applying an-air stream in a downward direction against each face of the upwardlymoving web, and deflecting means for deflecting the air against each face of the web alternately to vibrate the web and rid the same of surplus cooling fluid.

16. In coating apparatus comprising means for applying coating material to a continuously adv vancing web of material to be treated, means for applying a cooling fluid to the coated material;

web guiding means for effecting upward travel of the web after the cooling operation, the combination of means for applying an air blast against each face of the upwardly traveling web contra to the direction of travel of the web and a pair of vanes rotatable toward the web adjacent each face thereof, said vanes being offset circumferentially with respect to each other, and adapted to pocket some of said air alternately at each side of the web, thereby causing deflection of the web first in onedirection, and then the other out of the plane of its faces, to rid the web surface of excess cooling fluid.

ADOLPI-I POTDEVIN. 

